. >> jamie: and this fox news alert, a major break in the investigation into the terror attack in benghazi, libya. authorities in egypt arresting this man in cairo, mohammed ahmad. he's identified as the alleged ring leader of an al-qaeda-linked group that is suspected of taking part in the september 11th attack on the u.s. consulate where ambassador chris stevens and three other americans were killed. u.s. intelligence reportedly take part in the capture. molly henneberg has more for us from washington. >> hi, jamie, a leader in the terror world, ambitious and very dangerous and now, egyptian authorities aided have him. and the u.s. officials have been tracking him for months according to the wall street journal and interest in him intensified after some of his follow,participated in the attack on the consulate in libya. we don't have details how or when-- how or where he was detained. u.s. officials have not been able to interrogate him yet. here is what we do know: he's a former egyptian jihad member, released from prison in march -- he was in prison in egypt, he was released in march,